The FBI had a weak factual basis for opening and extending some investigations of U.S. activist groups and put individuals affiliated with Greenpeace USA on the terrorist watch list improperly, a report by the Justice Department's Inspector General released Monday found.

In addition, FBI Director Robert Mueller was also found to have unintentionally provided inaccurate testimony to Congress because he was given bad information. FBI personnel told him that certain persons of interest in international terrorism matters were expected to be present at an anti-war rally in Pittsburgh in 2002, according to the report.

The review addressed FBI activities from 2001 to 2006 related to the Thomas Merton Center; People for the Ethical Treatment of Animals (PETA); Greenpeace USA; The Catholic Worker; and an individual described as a Quaker peace activist.